|
Please
see the following for a new mail server setup. <Internet>
|
<Firewall>
/
\
<mail1>
<mail2>
\
/
\
/ <POP
Server> The mail
would come in to the mail servers, 1 and 2, (load balancing happens at the
firewall). These
servers would filter the mails and drop them in the "/var/spool/mail" folders on
themselves, (this is required for mail
filtering). If the
mail is forwarded, it is not filtered. The pop
server needs to retrieve the mails from both servers, and allow for the end
users to get the mail from the server. This
retrieval from mail1 and mail2 needs to happen every 5 minutes or less as to
prevent unnecessary delays in local mail
delivery.
Another
option, or alternative is that we can "map" the "/var/spool/mail/" directory on
the POP server from mail1 and mail2. This
would make the mail delivery almost instantaneous for the local users, and the
mail server/filtering would be load balanced between two different
servers. The
major drawback on this type of setup is that if the POP server goes offline, the
mail servers cannot drop mails into it. It will then drop the mails locally.
Once the connection comes back, the local directory will no longer be visible,
and mails will have been "Lost", (they can be retrieved, but it takes some
effort). Please let me know your thoughts on this and correct me if I am wrong. TIA, Srujan |
